redis防止重复提交的实现示例

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

package com.example.redis.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

/**
 * redis配置类
 * @author murphy
 * @date 2024/6/6
 */
@Configuration
public class RedisConfig {

    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(connectionFactory);
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        return template;
    }
}

spring:
  redis:
    host: 127.0.0.1
    port: 6379
    database: 0

package com.example.redis.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

/**
 * redis操作实现
 * @author murphy
 * @date 2024/6/6
 */
@Service
public class RedisService {

    private static final int TTL = 10; // 过期时间，单位是秒

    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    public boolean preventDuplicateSubmission(String userId) {
        String key = "praise_:" + userId;
        Boolean success = redisTemplate.opsForValue().setIfAbsent(key, "1", TTL, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);
    }
}

@Test
void contextLoads() {
  boolean res1 = redisService.preventDuplicateSubmission("1");
  System.out.println("第一次提交结果:" + res1);
  boolean res2 = redisService.preventDuplicateSubmission("1");
  System.out.println("第二次提交结果:" + res2);
  boolean res3 = redisService.preventDuplicateSubmission("1");
  System.out.println("第三次提交结果:" + res3);
}